This is the Plate Reverb from the upstairs at Smart Studios, Madison, WI - I was told it is an Ecoplate. The driver matches pictures of what was used on the ecoplates and the sheet is stainless steel. The small monitor speaker that hangs in front of
       
     
Vintage Gear / Plate Reverb
Vintage RCA ribbon microphones set up for mid-side. The unidirectional BK-5B ribbon mic uses a labyrith behind the ribbon to create a cardiod pattern. The KB-2A “Paintbrush” mic is small bidirectional ribbon.
       
     
Vintage Gear / Microphones
       
     
Vintage Gear / Synthesizers
       
     
Vintage Gear / Amplifiers
       
     
Vintage Gear / Speaker Cabs